Rocky, Do you have a hard drive running an OS other than WinXP that you could try in the main system? WinXP's Activation feature/bug can see if it's being run on the wrong computer (it looks for certain hardware devices and will only tolerate so many changes before it disables the OS). This could seriously affect its ability to bootup on a different system. A hard drive running a different OS would eliminate this possibility. This same line of thinking could be affecting the original hard drive's ability to boot up on another PC as well. I realize that none of this would affect your ability to get to the BIOS. I'm just trying to eliminate possibilities and narrow down the search. Peace, G Man PCTechTalk Owner ----- Original Message ----- From: "Rocky Fithian " <rockyfit@xxxxxxxxxxx> To: <pctechtalk@xxxxxxxxxxxxx> Sent: Friday, October 04, 2002 8:08 PM Subject: -=PCTechTalk=- Re: Computer Down HELP OK, Glen and GuitarMan here is what I have done. I cleaned out everything. I disconnected the HDDs and Roms and checked the voltages that I had listed and there is no change. Guess they are OK. I took the hard drive out of the main machine and tried it in another XP machine as master and it booted part way and stopped. I took a known good master XP os hard drive and put it in the main machine and it would not boot at all. Don't even get the bios to show. It will not boot to a floppy or CD and I have them listed to boot first and C as last choice. I did all this switching of drives after it was cool so heat don't seem the be the causing the problem. I built this myself and the CPU has a big fan and heatsink on it and it was set with heatsink grease. The CPU was bought as a unit with fan and heatsink. I have not pulled it up as yet. From what you guys have said it looks like it may be the CPU or the Mobo only because it will not boot a known good hard drive and the drive is the one I using right not to write this message. What does that make you think? Rocky To unsub or change your email settings: //www.freelists.org/webpage/pctechtalk To access our Archives: http://groups.yahoo.com/group/PCTechTalk/messages/ //www.freelists.org/archives/pctechtalk/